As HPGURU said, you should go into your TV settings and attempt to update your TV's software. If Spotify is available for your device then it will be installed automatically, however I don't see Spotify being available at all on your device.
If Spotify isn't available, one fairly inexpensive alternative is a new or old Chromecast. I personally have the 1st gen and it works very well.
What's a Spotify Rock Star, and how do I become one?